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A rod of brass la held in hand and rubbed with fur. The rod is found to have

A. no charge

B. positive charge

C. negative charge

D. can't be said

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  1. The cell that can be recharged, after it has run down, by passing a direct current through it from a…
  2. When temperature decreases, resistance of metals to flow of electricity
  3. The transistor was invented by
  4. Heat is transmitted from one end of a metal rod to its other end by the method of
  5. The image formed by a plane mirror is
  6. When an electric bulb breaks, there la an explosive sound. That is due to
  7. Atoms which have the same atomic number but different mass numbers are called
  8. When a bowler spins a ball, it changes its direction in the air. This is due to
  9. The Cact that the compass needle does not point true north was observed first by
  10. A piece of ice is Boating In water kept in a beaker. When all the ice melts the level of water will
  11. The strength of an electromagnet can be increased by
  12. When we sweat, we feel comfortable under a fan because
  13. The extremely luminous objects located at the centre of some distant galaxies and which are sources…
  14. The Solar System lies near the edge of a galaxy known as
  15. The nuclear model of atom was first visualised by
  16. To produce beats it is necessary to have two waves
  17. Of the following which has got the highest frequency?
  18. Cosmic rays are
  19. The characteristics of a musical note are
  20. The speed at which light travels in vacuum is
  21. The acoustical quality of a room depends on
  22. X-rays were discovered by
  23. The overhead wires supported by high towers in the grid system carry
  24. The device for tracking and locating the position of a moving object in space is called
  25. In a river, the currents are fastest where the river la
  26. Mercury does not stick to glass because
  27. Which is the densest planet of the solar system?
  28. The orbit of Venus lies between those of
  29. At what temperature do the Fahrenheit and Kelvin scales give the same reading?
  30. Rays similar to X-rays but of smaller wave length that are given off by radioactive substances are